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https://github.com/webmproject/libwebp.git
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Support for 'do not blend' option in vwebp
Change-Id: I563e192fa727816d11d8647c559ec407205ef40b
This commit is contained in:
Urvang Joshi
parent
6284854bd5
commit
dcf652223a
@ -60,12 +60,8 @@ static struct {
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WebPDecoderConfig* config;
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const WebPDecBuffer* pic;
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WebPDemuxer* dmux;
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WebPIterator frameiter;
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struct {
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int width, height;
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int x_offset, y_offset;
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enum WebPMuxAnimDispose dispose_method;
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} prev_frame;
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WebPIterator curr_frame;
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WebPIterator prev_frame;
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WebPChunkIterator iccp;
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} kParams;
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@ -77,7 +73,8 @@ static void ClearPreviousPic(void) {
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static void ClearParams(void) {
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ClearPreviousPic();
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WebPDataClear(&kParams.data);
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WebPDemuxReleaseIterator(&kParams.frameiter);
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WebPDemuxReleaseIterator(&kParams.curr_frame);
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WebPDemuxReleaseIterator(&kParams.prev_frame);
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WebPDemuxReleaseChunkIterator(&kParams.iccp);
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WebPDemuxDelete(kParams.dmux);
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kParams.dmux = NULL;
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@ -147,25 +144,25 @@ static int ApplyColorProfile(const WebPData* const profile,
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//------------------------------------------------------------------------------
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// File decoding
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static int Decode(void) { // Fills kParams.frameiter
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const WebPIterator* const iter = &kParams.frameiter;
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static int Decode(void) { // Fills kParams.curr_frame
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const WebPIterator* const curr = &kParams.curr_frame;
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WebPDecoderConfig* const config = kParams.config;
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WebPDecBuffer* const output_buffer = &config->output;
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int ok = 0;
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ClearPreviousPic();
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output_buffer->colorspace = MODE_RGBA;
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ok = (WebPDecode(iter->fragment.bytes, iter->fragment.size,
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ok = (WebPDecode(curr->fragment.bytes, curr->fragment.size,
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config) == VP8_STATUS_OK);
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if (!ok) {
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fprintf(stderr, "Decoding of frame #%d failed!\n", iter->frame_num);
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fprintf(stderr, "Decoding of frame #%d failed!\n", curr->frame_num);
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} else {
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kParams.pic = output_buffer;
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if (kParams.use_color_profile) {
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ok = ApplyColorProfile(&kParams.iccp.chunk, output_buffer);
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if (!ok) {
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fprintf(stderr, "Applying color profile to frame #%d failed!\n",
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iter->frame_num);
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curr->frame_num);
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}
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}
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}
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@ -176,10 +173,10 @@ static void decode_callback(int what) {
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if (what == 0 && !kParams.done) {
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int duration = 0;
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if (kParams.dmux != NULL) {
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WebPIterator* const iter = &kParams.frameiter;
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if (!WebPDemuxNextFrame(iter)) {
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WebPDemuxReleaseIterator(iter);
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if (WebPDemuxGetFrame(kParams.dmux, 1, iter)) {
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WebPIterator* const curr = &kParams.curr_frame;
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if (!WebPDemuxNextFrame(curr)) {
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WebPDemuxReleaseIterator(curr);
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if (WebPDemuxGetFrame(kParams.dmux, 1, curr)) {
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--kParams.loop_count;
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kParams.done = (kParams.loop_count == 0);
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} else {
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@ -188,7 +185,7 @@ static void decode_callback(int what) {
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return;
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}
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}
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duration = iter->duration;
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duration = curr->duration;
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}
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if (!Decode()) {
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kParams.decoding_error = 1;
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@ -281,40 +278,45 @@ static void DrawCheckerBoard(void) {
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static void HandleDisplay(void) {
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const WebPDecBuffer* const pic = kParams.pic;
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const WebPIterator* const iter = &kParams.frameiter;
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const WebPIterator* const curr = &kParams.curr_frame;
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WebPIterator* const prev = &kParams.prev_frame;
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GLfloat xoff, yoff;
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if (pic == NULL) return;
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glPushMatrix();
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glPixelZoom(1, -1);
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xoff = (GLfloat)(2. * iter->x_offset / kParams.canvas_width);
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yoff = (GLfloat)(2. * iter->y_offset / kParams.canvas_height);
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xoff = (GLfloat)(2. * curr->x_offset / kParams.canvas_width);
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yoff = (GLfloat)(2. * curr->y_offset / kParams.canvas_height);
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glRasterPos2f(-1.f + xoff, 1.f - yoff);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glPixelStorei(GL_UNPACK_ROW_LENGTH, pic->u.RGBA.stride / 4);
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if (kParams.prev_frame.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
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if (prev->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND ||
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curr->blend_method == WEBP_MUX_NO_BLEND) {
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// TODO(later): these offsets and those above should factor in window size.
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// they will be incorrect if the window is resized.
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// glScissor() takes window coordinates (0,0 at bottom left).
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const int window_x = kParams.prev_frame.x_offset;
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const int window_y = kParams.canvas_height -
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kParams.prev_frame.y_offset -
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kParams.prev_frame.height;
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int window_x, window_y;
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if (prev->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
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// Clear the previous frame rectangle.
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window_x = prev->x_offset;
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window_y = kParams.canvas_height - prev->y_offset - prev->height;
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} else { // curr->blend_method == WEBP_MUX_NO_BLEND.
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// We simulate no-blending behavior by first clearing the current frame
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// rectangle (to a checker-board) and then alpha-blending against it.
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window_x = curr->x_offset;
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window_y = kParams.canvas_height - curr->y_offset - curr->height;
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}
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glEnable(GL_SCISSOR_TEST);
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// Only updated the requested area, not the whole canvas.
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glScissor(window_x, window_y,
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kParams.prev_frame.width, kParams.prev_frame.height);
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// Only update the requested area, not the whole canvas.
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glScissor(window_x, window_y, prev->width, prev->height);
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glClear(GL_COLOR_BUFFER_BIT); // use clear color
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DrawCheckerBoard();
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glDisable(GL_SCISSOR_TEST);
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}
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kParams.prev_frame.width = iter->width;
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kParams.prev_frame.height = iter->height;
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kParams.prev_frame.x_offset = iter->x_offset;
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kParams.prev_frame.y_offset = iter->y_offset;
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kParams.prev_frame.dispose_method = iter->dispose_method;
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*prev = *curr;
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glDrawPixels(pic->width, pic->height,
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GL_RGBA, GL_UNSIGNED_BYTE,
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@ -330,9 +332,9 @@ static void HandleDisplay(void) {
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glColor4f(0.90f, 0.0f, 0.90f, 1.0f);
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glRasterPos2f(-0.95f, 0.80f);
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PrintString(tmp);
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if (iter->x_offset != 0 || iter->y_offset != 0) {
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if (curr->x_offset != 0 || curr->y_offset != 0) {
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snprintf(tmp, sizeof(tmp), " (offset:%d,%d)",
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iter->x_offset, iter->y_offset);
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curr->x_offset, curr->y_offset);
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glRasterPos2f(-0.95f, 0.70f);
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PrintString(tmp);
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}
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@ -386,6 +388,8 @@ static void Help(void) {
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int main(int argc, char *argv[]) {
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WebPDecoderConfig config;
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int c;
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const WebPIterator* const curr = &kParams.curr_frame;
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WebPIterator* const prev = &kParams.prev_frame;
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if (!WebPInitDecoderConfig(&config)) {
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fprintf(stderr, "Library version mismatch!\n");
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@ -457,10 +461,10 @@ int main(int argc, char *argv[]) {
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printf("Canvas: %d x %d\n", kParams.canvas_width, kParams.canvas_height);
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}
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kParams.prev_frame.width = kParams.canvas_width;
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kParams.prev_frame.height = kParams.canvas_height;
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kParams.prev_frame.x_offset = kParams.prev_frame.y_offset = 0;
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kParams.prev_frame.dispose_method = WEBP_MUX_DISPOSE_BACKGROUND;
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prev->width = kParams.canvas_width;
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prev->height = kParams.canvas_height;
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prev->x_offset = prev->y_offset = 0;
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prev->dispose_method = WEBP_MUX_DISPOSE_BACKGROUND;
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memset(&kParams.iccp, 0, sizeof(kParams.iccp));
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kParams.has_color_profile =
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@ -476,20 +480,20 @@ int main(int argc, char *argv[]) {
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#endif
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}
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if (!WebPDemuxGetFrame(kParams.dmux, 1, &kParams.frameiter)) goto Error;
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if (!WebPDemuxGetFrame(kParams.dmux, 1, curr)) goto Error;
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kParams.has_animation = (kParams.frameiter.num_frames > 1);
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kParams.has_animation = (curr->num_frames > 1);
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kParams.loop_count = (int)WebPDemuxGetI(kParams.dmux, WEBP_FF_LOOP_COUNT);
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kParams.bg_color = WebPDemuxGetI(kParams.dmux, WEBP_FF_BACKGROUND_COLOR);
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printf("VP8X: Found %d images in file (loop count = %d)\n",
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kParams.frameiter.num_frames, kParams.loop_count);
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curr->num_frames, kParams.loop_count);
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// Decode first frame
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if (!Decode()) goto Error;
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// Position iterator to last frame. Next call to HandleDisplay will wrap over.
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// We take this into account by bumping up loop_count.
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WebPDemuxGetFrame(kParams.dmux, 0, &kParams.frameiter);
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WebPDemuxGetFrame(kParams.dmux, 0, curr);
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if (kParams.loop_count) ++kParams.loop_count;
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// Start display (and timer)
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